SATELLINE-3AS-EPIC-C

Powerful High Speed Radio Modem with diversity reception

• RS interface data speed 300...38400 bit/s
• Interfaces RS-232, RS-422 or RS-485
• Includes heat sink
• Error correction (FEC)
• Repeater function
• Programmable output power 1 W...10 W

High-Speed UHF Radio Modem with 10W Output Power and Diversity Receiving

Radio modem SATELLINE-3AS Epic includes a high power (10W) transmitter and two receivers which gives you numerous diversity functions. Due to the powerful transmitter the coverage is better than before and the distances between the stations can be remarkably longer. With the diversity receiver the modem selects the best signal from the ones received in distinction to the two different points. Thus we can improve the reliability of the connection where there is a lot of reflections and fading. These new characteristics make it possible to more than double the distances between the modems compared to the existing SATELLINE-3AS radio modems.

Diversity Reception

In radio systems it is not necessary to have a direct visual connection between the master station and the moving substation because the radio signal transmits by reflecting from buildings and terrain e.g. such as hills. The fading occurs when the radio signals reflect from several objects to the antenna of the receiver. The propagation speed of the radio signals is at the speed of light so the signals reflecting from different objects arrive into the receiver at different times. The signals at the receiving antenna are in different phases so in the worst case two equally strong signals being in opposite phases cancel each other out and thus will cause the fading. The dips of the signal appear with half wave intervals. In connections, which are only based on reflections, the reliability of the signal receiving is depending on the position of the receiving antenna even ones fairly close to the base station.

By setting the two antennas of the diversity receiver at least ¾ x wavelength apart from each other the message can always be received by one of the receivers if not both. When installing the antennas in this way they are rarely at the same time in the fading dips.

TECHNICAL SPECIFICATIONS FOR SATELLINE-3AS(d) Epic

TRANSCEIVER
Frequency range	400 ... 470 MHz
Channel spacing	12.5 / 25 kHz
Communication mode	Half-duplex
Transmitter
Carrier power	1 W ... 10 W / 50 ohm
Receiver
Sensitivity	-116 ... -110 dBm (BER < 10 E-3)
Adjacent channel selectivity	> 60 dB> 70 dB
Diversity scheme	Space diversity, selection combining
DATA MODEM
Interface	RS-232 or RS-422. RS-485
Interface connector	D 15, female
Data speed of RS interface	300 - 38400 bps
Data speed of radio interface	19200 bps (25 kHz channel)
	9600 bps (12,5 kHz channel)
Data formats	Asynchronous data
GENERAL
Operating voltage	+11.8 ... + 30 Vdc
Power consumption	3 VA typical (receive)
	25 VA typical (transmit)
	0.05 VA typical (when DTR is "0")
Temperature range	-25°C ... +55°C
Antenna connector	TNC, 50 ohm, female
Construction	Aluminium enclosure
Size H * W * D	151 * 123 * 31 mm
Weight	550 g